Calculating machine



Feb. 16, 1943. c. M. FRIDEN zrrm CALCULATING MACHINE Filed Jan. 16, 1939 9 Sheets-Sheet 1 5 A w an W1 N E//. R VF w m k M Z a m Q V.

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CALGUIQATING MACHINE Filed Jan. 16. 1939 9 Sheets-Sheet 4 Q&

mm g Q INVENTORS CARL M. FE/flF/V FPIDff/C'k C. CAEROZL J2. BY

A TTORNEY Feb. 16, 1943. c, FRIDEN ETAL 2,311,354

GALCULAT ING MACHINE Filed Jan. 16, 1939 9 Sheets-Shee t 5 INVENTORS :42: M. FewE/v PIMP/CK c. cneeou .12

BY A M A TTORNEY ww- E@ Feb. 16, 1943. c. M. FRIDEN ETAL CALCULATING MACHINE Filed Jan. 16, 1939 9 Sheets-Sheet 6 o o a INVENTDRS 6424 M. rams/v rezone/m c. 4770204 L J2,

Feb; 16, 1943'.

c. M.FRIDEN EI'AL CALCULATING MACHINE Filed Jan. 16, 1939 9 Sheets-Sheet '7 INVENTOR; CARZ M. F'E/DEN FPiDt'E/C'K C. CAEEDL! J2.

ATTORNEY.

Feb. 16, 1943. c. M. FRIDEN ETAL CALCULATING MACHINE Filed Jan. 16, I939 9 Sheets-Sheet 8 & II/1111111011111 S M M 4 M01. 0 EB VF m Feb. 16, 1943. c. M. FRIDEN ETAL CALCULATING MACHINE Filed Jan. 16, 1939 9 Sheets-Sheet 9 INVENTORJ CARL M. FE/DE'N fPlDfE/L'H C. CAEEOZZ JE BY ATTORNEY Patented Feb. 16, 1943 2,311,354 CALCULATING mcnmr:

Carl M. Friden and Frederick o. Carroll, Jr., Oakland, Calif., assignors to Friden Calculating Machine 00., Inc., a corporation of California Application January 16, 1939, Serial No. 251,058

Claims. This invention relates to calculating machines,

and is concerned more particularly with the provision of an improved calculating machine of the type having clutch-driven cyclically operable actuating means which can be operated optionally as a key-set calculator of the usual character in multiplying and dividing operations or as a key-responsive calculator for the addition and subtraction of items.

It is a general object of the invention to provide an improved calculating machine which can be used in both key-set and key-responsive operations as desired.

Another object of the invention is to provide a calculating machine which includes improved mechanism comprising a single key which is manipulatable for converting the machine from key-set multicyclic operation to key-responsive uni-cyclic operation.

Another object of the invention is to provide a calculating machine of the character described including novel and improved mechanism for so controlling the operation of the machine that only one cycle of the actuating means can occur for each item entering operation on the keyboard.

Another object of the invention is to provide a calculating machine of the character described which is automatically restored to key-set op-- erating condition upon manipulation of a control key which initiates a clearing operation of the machine.

Another object of the invention is to provide a calculating machine of the character described having a settable control means which conditions the machine for key-set or key-responsive operation and which also sets the machine for additive or subtractive key-responsive operation.

Another object of the invention is to provide a calculating machine having uni-directionally operable actuating means and bi-directlonally operable numeral wheels and which attains the foregoing objects.

The above and other objects of the invention will be apparent from the following description of a preferred embodiment thereof, as shown in the accompanying drawings.

In the drawings:

Fig. 1 is a plan view of a calculating machine Q embodying the invention.

Fig. 2A is a vertical, longitudinal section of v the rear part of the machine andv is taken in a plane indicated by line 2a-2a in Fig. 1.

Fig. 2B is a vertical, longitudinal section of the front part of the machine and is taken in a plane indicated by line 212-21) in Fig. 1.

Fig. 3 is a transverse sectional view thru a part of the keyboard in a plane indicated by line 33 in Fig. 2B.

Fig. 4A is a plan view of the rear portion of the machine with the carriage and keyboard removed, and with certain parts partially broken away and others shown in outline to simplify and clarify the view.

Fig. 4B is a plan view of the front portion of the machine with a part of the keyboard and the selection slides controlled thereby omitted. Fig. 5 is a sectional elevation of the shift keys and the resetting key and the associated drive control mechanism, the view being indicated by line 55 in Fig. 1.

Fig. 6 is a fragmentary sectional elevation of the clutch mechanism.

Fig. '7 is a sectional elevation of the plus and minus keys and associated mechanism as indicated by line 11 in Fig. 1, the division mechanism being omitted from the view.

Fig. 8 is a sectional elevation of certain control mechanism as indicated by line 8-8 in Figs. 4A and 4B, including the controlling connections for both the shift and driving mecha GENERAL Da'scm'rron (Fig. 1)

The'invention is described in a preferred form as embodied in a Thomas type calculating machine as disclosed, for example, in the co-pending application of Carl M. Friden, Serial No. 724,482, filed May 8, 1934, for Calculating machine. Referring to Fig. 1, the machine includes body I2 comprising base [3 and casing l4 suitably secured thereon, and in which the actuating, selecting, and control mechanisms are mounted. Carriage l6 carries numeral wheels I! and I8 of the accumulator and revolutions counter, respectively, and can be shifted end wise in either direction by manipulation of respective shift keys i9, 20 through mechanism described hereinafter.

For key-set operation, values are entered into the machine by depression of numeral keys 22 of the keyboard in the various ordinal rows thereof, keys 22 being releasable individually by istered additively and subtractively in the accumulator by depression of plus key 25 and minus key 25, respectively, while the number of registrations or its complement can be entered in the revolutions counter by proper setting of control lever 21.

Values registered in numeral wheels I1 and I3 can be erased, i. e. the registers can be zeroized, by manipulation of respective manually operable resetting handles 28, 29, or by power through depression of return and clear key 30. Depression 'of key 30 first effects return of carriage ii to its farthest left position and subsequently effects resetting of numeral wheels I! alone, or both numeral wheels i1 and numeral wheels I8 as selected by the setting of control lever 3|.

The machine may also be equipped to perform automatic plural order division by means of conventional construction including division control lever 32.

The machine is optionally settable for keyresponsive operation to add or subtract directly in response to depression of numeral keys 22 as determined by the setting of control key 33 in either direction from the central neutral position thereof shown in Fig. l, as described more fully hereinafter.

.Dmvnyo. AND AcTUATINo MECHAnisMs (Figs. 2A, 4A, 5, 6 and 9) power from which a single path of power leads to provide a cyclic clutch-controlled drive for all power driven parts of the machine. The source of power comprises electric motor 35 (Fig. 2A) whose shaft 31 (Figs. 2A and is connected by gearing 38 with a clutch indicated generally at 39 (Figs. 4A and 6). Clutch 39 comprises driving ratchet 4| journalled on shaft 42 and driven from gearing 38, and a driven element comprising spring-urged pawl 43 pivoted at 44 in disc means 45 carried by transverse shaft 42 journalled in side plates 34 and 35. The cyclic drive for shaft 42 is provided by engagement and disengagement of pawl 43 (Fig. 6) with ratchet 4| under the control of clutch control lever 41 piv-= oted at 48 on side plate 35. The parts are shown in full-cycle position in Fig. 6 where the nose of lever. 41 is engaged with the tail of pawl 43, and roller 45 on lever 41 is engaged with its seat in disc means 45.

v The drive -mechanism includes a source of actuating cylinder in a conventional manner by means including a pair of differential springurzed slides 51 (Figs. 2A, 28, 4A and 4B) associated with each ordinal row of numeral keys 22 in a manner described hereinafter. Interaccumulator by selective positioning of plus-.

minus gears 62, 53 in the conventional manner under control of transversely extending strap 68 which is carried by a pair of similar arms 81 secured on shaft 68, which is suitably iournalled in the frame plates 36 and-35. Strap 66 and the series of plus-minus gears are urged to their central position shown in Fig. 2A by suitable centralizing means comprising opposed spring=urged arms 69' (Figs. 2A and 9) pivoted on plate 34 and engaging opposite sides of pin it on one of arms 67. The various control means for positioning the plus-minus gears 52, 63 are described hereinafter.

Accumum'roa MECHANISM (Figs. 1,211 and 9) Accumuletor.-The accumulator comprises a series of numeral wheels l'l (Figs. 1 and 2A), each of which is carried at the upper end of a numeral wheel shaft 12 suitably journalled in carriage frame 13 and carrying a numeral wheel gear 64. Each shaft 12 has suitable springurged ball and gear centering means 174 to insure alignment of the displayed numeral on wheel I! with sight opening I5 in the carriage cover.

Tens transfer.-Any suitableconventionai form of transfer mechanism may be associated with the accumulator and its actuating means. In the form selected for illustration, the mechanism includes a transfer trip lever I5 (Fig. 2A)- mounted on carriage frame 13 in each order of the 'accumulator, a ten-tooth gear '87 on each of shafts 55 (except the lowest order) and a pair of transfer actuators I3 on each shaft 52. The above The clutch mechanism described generally above is of the construction disclosed in the co-pending application of Carl M. Friden; Serial No. 145,979, filed June 2, 193'L'but may be of any other suitable construction.

The clutch-driven transverse shaft 42 serves to provide a cyclic uni-directional drive for the actuating means of both the accumulator and the revolutions counter, for the shift mechanism and for the zero resetting mechanism.

' Shaft 42 (Figs. 2A and 4A) has bevel gear connections 5| with longitudinally extending accumulator actuating shafts 52 suitably joumalled in cross brackets 43 and 50 which extend between side plates 34 and 35. Each shaft 52 carries a pair of toothed actuating cylinders 53 for a. pair of adjacent orders of the machine, and for cooperation with the teeth of each cylinder 53, a

pair of ten tooth gears 54 are slidably and non-- rotatably mounted on square shaft 55 which is suitably journalled in cross brackets 55, 49 and 50. As usual in this type of machine, a shaft 53 is provided for each order of the actuating means. Gears 54 are selectively positioned with respect to the associated stepped teeth of the mechanism is of the type disclosed in said application Serial No. 724,482 and the co-pending application of Carl M. Friden, Serial No, 75,307, filed April 20, 1936.

Resetting means-Suitable means of conventional construction are provided in carriage It for resetting numeral wheels I! to zero registration which includes rack bar 8| (Figs. 2A and 9) mounted for endwise sliding movement in carriage frame 13 adjacent the upper ends of numeral wheel shafts 12. The teeth of rack bar 8| form a plurality of racks for cooperation with mutilated gears 83 on numeral wheel shafts I2 in a conventional manner, as disclosed, for example, in said application Serial No. 724,482.

For manual operation rack bar 8| is provided with handle 28 (Fig. 1) by means of which the accumulator register can be reset to zero. The power operation of the resetting or zeroizing means is described hereinafter.

Rnvow'nous COUNTER Mecrramsm (Figs. 1 and 2A) spective shafts 81, which are journalled in carriage frame 13 and bar 88 supported thereon. A numeral wheel I8 is provided for each ordinal position of the carriage, and the displayed numeral of each wheel I8 (Fig. 1) is maintained in alignment with the associated sight opening 89 by ball and gear means 99. The number of actuations of the accumulator are registered in counter numeral wheels I8 (Fig. 2A) by an actuator of conventional construction indicated generally at 9I and driven in a suitable manner from transverse shaft 42.

Resetting means.-The means provided for resetting numeral wheels I 8 (Figs. 1 and 2A) of the counter register to zero is similar in construction and operation to that described in connection with accumulator wheels I1, and includes manually operable rack bar 92 suitably mounted in the carriage for cooperation with mutilated gears 93 on shafts 81. Rack bar, 92 carries upright handle 29 to provide for manual operation thereof.

The revolutions counter mechanism is of the type shown and described in said application, Serial No. 724,482.

CARRIAGE Smrr MECHANISM (Figs. 2A., 4A, 5 and 8) As stated, shift keys I9 and 29 control mecha-- n sm for shifting carriage I6 selectively in either direction, and such shifting mechanism may be of conventional construction, as for example of v the type disclosed in the copending application of Carl M. Friden, Serial No. 27,338, filed June 19, 1935. Carriage frame 13 (Fig. 2A) carries rack I2'I having teeth operatively engaged by a pair of pins I22 on shift gear I23, journalled on bracket 55. in either direction thru suitable reversing gearing I24 from one of gear sleeves I26 or I21 (Figs. 2A and 4A) journalled in bracket 55 and plate I28 supported thereon. Gear sleeve I21 is slotted at its front end to receive and be driven by the teeth of shiftable collar I29 having a slidable driving connection with one of actuating shafts 52 Gear sleeve I26 is similarly adapted to be driven from an adjacent shaft 52, and each shiftable collar I29 is controlled by a fork I3I at the rear end of a rod I32 spring-urged forwardly into cooperative relation with depending arms I33, I34 (Figs. 2A, 4A, and 8) on shaft I36 and sleeve I31, respectively. Shaft I36 and sleeve I31 carry respective control arms I38 and I39 (Figs. 4A and 8) operatively related to pins I4I on respective shift keys I9 and 29, so that depression of each shift key will engage one of the drive connections to control shifting of the carriage in a selected direction in accordance with the depressed key.

Pins I4I (Fig. 5) of keys I9 and 29 also overlie cam arm I42 carried by lever II6, so that the clutch is engaged andthe motor circuit closed as previously described upon depression of a shift key.

Powm ZERO Rasn'r'rmc (Figs. 2A, 4A, 5 and 9) The means for resetting the accumulator and the revolutions counter is of the type disclosed in the co-pending application of Carl M..Friden, Serial No. 42,268, filed September 26, 1935, and the resetting operation includes shifting or return of the carriage to an end position where the resetting racks are operated. Return and resetting key 39 (Fig. 5) is mounted for substantially Shift gear I23 is selectively driven latch slide I51 which may be moved to inactive position at the end of the resetting operation by any suitable means for operating latch releasing bellcrank I58.

To enable the drive for operating resetting racks 8| and 92 at the end of the carriage return, key 39 (Fig. 8) operates thru arm I52 and sleeve I53 (Fig. 2A) to rock cam arm I59 so that rod I6I and fork I62 (Fig. 4A) are moved rearwardly to engage shi .able collar I63 with sleeve I64 carrying cam I66. Cam I66 (Figs. 4A and 9) operates thru a suitable drive connection including arm I61, slide I68 and tooth I 69 to reciprocate resetting rack 8| of the accumulator. Resetting rack 92 of the revolutions counter is also actuated if connected for movement with rack 8|.

Key 39, which controls the power zero resettin described above is also related to the control means for key-responsive operation as will be described presently. I

. KEYBOARD (Figs. 2-4B and 10) As previously explained, the pair of ten-tooth gears 54 (Figs. 2A and 4A) of an order are positioned by respective differential slides 51 which are guided by vertical slots in brackets 59 adjacent their rear ends and in similarly slotted bracket I1I (Fig. 2B) adjacent their front ends. Each slid 51 is supported for substantially endwise movement by parallel arms I12 and I13 (Figs. 2A and 2B) which are pivotally supported in respective cross rails I14, I15, and each slide 51 is urged rearwardly by spring I16 connected to the associated arm I13. Each slide 51 is provided with cam surfaces I11 of varying inclination for cooperation with pins I 18 on keys 22 to effect a differential movement of a slide corresponding to the value of the depressed key, the slide being definitely located when the pin I18 enters the socket I19 at the base'of each cam surface I11. Oneslide 51 of each order cooperates with the 1 to "5 keys 22 thereof, while the other slide 51 of an order cooperates with "6 to 9 keys 22 thereof.

Keys 22 (Figs. 2A, 2B, and 3) of each bank or ordinal row are mounted for vertical or endwise movement by opposed U-shaped key frames I8I which are secured together by transverse tie rods I82, which also extend thru slots in the key stems to guide their movement. Key frames I8I are mounted in the machine by respective brackets I84 extending between side plates 34 and 35. The keys are urged to raised position by spring I83 extending under pins I85 thereon and over upper rods I82, and may be latched in depressed position by latching slide I86 mounted for endwise sliding movement in key frames I8I and urged forwardly by spring I81. During depressing movement of a key 22, cam surface I88 thereof moves latching slide I86 rearwardly to release a previously depressed key, and latching slide I 86 will subsequently engage in latching notch I89 of the key 22 being depressed. Latching slides I86 are operable individually by ordinal clear keys 2I and collectively by bail I9I (Figs. 2B and 4B) pivoted on transverse rod I 92 and operable hv clear key 23, and also automatically as will be de scribed in connection with the live key operation of themachine.

The keyboard as described above is of the conventional type employed in key-set calculating machines.

KEY-SET OPERATION CONTROL (Figs. 4.4-7)

To control addition or subtraction of items in the accumulator during key-set operation, respective plus and minus keys 25 and 26 (Fig. 7) of conventional type are slidably mounted for endwise movement on plate IOI which is secured in spaced relation from side plate 35 (Figs. 4A and 43). Keys 25 and'26 (Fig. '1) are suitably springurged to their upper positions and have respective pins I02 cooperatively related respectively to oppositely inclined cam surfaces I03, I04 of plusminus slide I00. Slide I is pivotally connected to arm I01 pivoted on plate IN and has an adjustable pivotal connection with arm I08 (Figs. 4A and 7) secured on shaft 00, and is thereby mounted for 'endwise movement in response to clepremion of keys 25 and 26 to rock shaft 58 and effect meshing of plus gears 02 or minu gears 63 with numeral wheel gear 54. Upon release of a depressed key, gears 52, 63 and slide I are returned to central neutral position by the centralizing arms 69 heretofore described and are free to move relative to the plus and minus keys during key-responsive operation of the machine.-

In addition to the setting of the plusminus gears, depression of keys and 26 simultaneously serves to control engagement of the clutch and closing of the motor circuit. Keys 25 and 26 (Fig. '7) have respective pins III overlying suitable cam surfaces of clutch slide H2 mounted for endwise sliding movement on plate l0I. At its rearward end, slide 2 abuts pin II3 (Figs. 6 and '7) carried at the upper end of clutch control lever 41. Pin H3 is normall engaged by' the hooked end of link II4 g. 6) which is pivoted 'at 5 to the upper end of lever H6 (Fig. 5) pivoted on side plate and having a pivotal connection at lower end with pivotally mounted lever II1. At its lower end, lever Il'l carries laterally extending insulated pin 0 which overlaps one of contacts N9 of the motor circuit. Thus, movement of clutch control lever 41 to and from clutch engaging position also serves to move contacts H9 to and from circuit closing position while link H4 is engaged with pin I I3 under the influence of spring I20. From the foregoing description, it is seen that depression of either of keys 25 or 26 will cause one or more registrations in the accumulator of the number set in the keyboard during key-set operation of the machine.

KEY-RESPONSE]! OPERATION Connor.

(Figs. 2.4-6, 8-10) The machine is settable to operate in addition and subtraction in response to depression of the numeral keys, which can be enabled optionally to control the drive and effect cyclic operation of the clutch.' Key 33 (Fig. 9) which controls the condition or state of the machine for key-set and key-responsive operation is mounted for endwise sliding movement to control the state of the machine and in depressed position is movable to control addition and subtraction. Key 33 has slot 232 engaged by stud 23I and extends between latching studs 235, 234 therefor which prevent any rocking movement 'of the key until i it is fully depressed. The key is urged to raised position by spring 238 tensioned between stud 253i and pin 231 on the key stem. Depression of key 83 serves to condition various parts of the machine for key-responsive operation as will now.

operatively related to the plus-minus gears and their control means. Link 252 is supported by rollers 263 on plate 34 and at its rearward end is pivotally connected at 245 to one of supporting arms 01 for strap 80 which controls the position of plus-minus gears 62, 03. After depression of key 33, it can be rocked either forwardly or rear-. wardly of the machine to move link 242 to engage gears 02 and 03 with numeral wheel gears 64 to select. positive or negative registration, and the key is latched in adjusted position by the engagement of one of its notches 246 or 241 with one of studs 233, 230.

Drive control.'Associated with each row of numeral keys 22 (Figs. 2A, 2B, 3, 4A, and 4B) is a slide 20I mounted for endwise movement in brackets and 111 between each pair of differential slides 51. in vertical alignment with the keys. Each slide 20I is urged rearwardly to inactive position by spring 202 (Fig. 2A) where slide ear 203 abuts bracket 50, and is moved from this position upon depression of one of keys 22 by the engagement of lower end 204 of the key with the associated cam surface 206 of slide 20I. Such forward movement 'of a slide 201 serves to rock bail 201 (Figs. 23 and 4B) which extends transversely of the machine, and is pivoted on rod 200. The lower edge of bail 201 is adapted for engagement by notched end 209 of link 2 which is pivotally connected at its other end to arm 2I2 on shaft I54. During key-set operation of the machine, link 2 is in the position shown in Figs. 2B andlO, so that rocking movement of bail 201 is idle. When the machine is conditioned for key-responsive operation by control key 33, link 2 ismoved into operative engagement with bail 201. For this purpose, link 2 is slotted intermediate its ends for pivotal and sliding engagement by stud 2I3 at one end of lever 2l4 pivoted at 2I6 on side plate 35, and which is rocked by control key 33 upon depression thereof.

when the operative engagement of bail 201 (Figs. 9 and 10) and link 2 is-maintained by latching of key 33 in depressed position, depression of any numeral key 22 will result in rocking of shaft I54 to start the drive after positioning ment of slide 51 and is entering the associated socket I10 at the time stem end 204 starts the movement of the'drive con-trolling slide 20I. Shaft extends transversely between side plates 34 and 35, and adjacent plate 34 (Figs. 5

and 8) carries arm 2! which is operatively related to pin M8 on lever H1, so that clockwise movement of shaft I56 and arm 2I8 as viewed I related to arm 25l on shaft in Fig. 8 will cause a similar movement of lever H1 to close contacts I I 3 and to engage the clutch through lever H6 (Fig. link H4 (Figs. 5 and 6) and clutch control lever 41.

Thus, the drive for the actuating means is enabled upon depression of one or more of numeral keys 22. Means is provided to insure complete depression of all keys 22 by disabling the drive if any key is incompletely depressed. For this purpose, normally closed contacts 22l (Fig.

8) are provided in the motor circuit in series with contacts H9. One of contacts 22! is carried by one of brackets I84 and the other is carried by upright arm 222 of bail 223 which extends transversely of the machine in operative engagement with the rearward ends of latching slides I86 for the keys 22. Bail 223 is pivotally supported by studs 224 and is spring-urged against slides I86 by spring 226. During depression of a key 22 (Figs. 2A, 2B and 8), the associated latching slide I86 is moved rearwardly and will rock bail 223 to open contacts 22l so that circuit will not be closed until all keys are either entirely raised or entirely depressed.

The drive during key-responsive operation is limited to one cycle for each manipulation of the keyboard, and the numeral keys corresponding to the digits to be entered must be depressed each time an item is entered. The mechanisms for controlling this operation as well as that for preventing latching of the numeral keys in depressed position are enabled by add-subtract control key 33 when moved to active position.

Depression of key 33 enables the means for determining uni-cyclic operation, and also enables automatic key release means operable during each cycle of the machine. For this purpose pin 23! (Fig. 9) on key 33 is operatively 252 which extends across the machine and at its other end carries arm 253 (Fig. 8) having pin 254 engaging a slot in link 256. Link -256 is reciprocated once during each cycle of the machine, and for this purpose has its rear end pivotally connected at 258 to the upper end of lever 25!! pivoted at 26| on side plate 35. The lower end of lever 253 is urged by spring 262 to engage cam 263 on shaft 42. The cyclic reciprocation of link 256 is made ineffective in the position of the parts shown in Fig. 8 by arm 253 which maintains notched end 251 of link 256 above key release bail I9l and notch 264 thereof above pin 21| on clutch disengaging bellcrank 212 (Fig. 5) pivoted at 213 on side plate 35 and gravityurged against stop 214. Bellcrank 212 has an arm underlying the bent end of clutch control link H4 so that counter-clockwise movement thereof serves to move link H4 in a clockwise direction to effect disengagement thereof from pin H3 on clutch control lever 41 and thereby permit the lever to move to clutch disengaging position.

As described above, arm 253 is urged to the position shown in Fig. 8 in engagement with stop 216 by spring 211 and serves to hold link 256 inactive during key-set operations. However, upon movement of key 33 to active position, arm 263 is actuated to lower link 256 and engage notches 264 and 251 with pin 21! and bail I91, respectively. Thus, during key-responsive operation, the clutch is engaged for only a single cycle by depression of a numeral key 22, and the depressednumeral keys are released near the end of each cycle of operation.

Rsnmss or KEY-RESPONSIVE Connor.

(Figs. 8 and 9) Means is provided for eflecting automatic restoring of the'settable control key 33 upon operation of a control key used in normalizing operation of the machine. As previously described, return and clear key 30 when depressed oscillates sleeve I53 (Figs. 8 and 9) which carries bent arm 266 (Fig. 9) having V-shaped cam notch 261 underlying the beveled end of key 33. If key 33 is in depressed position when key 30 is operated one of its beveled end surfaces of key 33 will be engaged with a wall of cam notch 261, the clearance between the beveled end of key 33 and cam notch 261 as well as the loose fit of pin 23l in slot 232 being such as to'provide for the downward and rocking movement of key 33 without binding against arm 266. Upward rocking movement of arm 266 upon depression of key 30 serves through the cam notch 261 to centralize key 33 so that spring 236 can restore key 33 to raised position. Depression of key 30 will restore key 33 to raised position.

OPERATION (Figs. 1-2B, 4B-6, 8-10) Key-set.-The machine is conditioned for keyset operation as illustrated in the drawings, key 33 (Figs. 1 and 9) being located in its raised or inoperative position. The key-set operation of the machine is conventional and detailed description thereof is believed unnecessary.

Key-responsive.--The machine is conditioned for key-responsive uni-cyclic operation by depressing key 33 (Figs. 1 and 9) and by moving the key rearwardly to set the machine for subtraction and by moving the key forwardly to set the machine for addition. As described, the depression of key 33 renders operative various means whereby simultaneous depression of selected numeral keys 22 will effect entry of the corresponding values either additively or subtractively in the accumulator; Repeated additions or subtractions can be made by repeatedly depressing the selected numeral keys.

Depression of key 33 (Figs. 9 and 10) operates through lever 2l4 to raise link 2 and engage notched end 209 thereof with bail 201 to enable the drive control from numeral keys 22, and through arm 25l (Fig. 9), shaft 252 (Fig. 4B) and arm 253 (Figs. 43 and 8) to lower link 256 and engage notched portions 251 and 264 thereof with bail I9! and pin 21l, respectively, to enable the key release and uni-cycle clutch control of numeral keys 22. After depression of key 33 (Fig. 9) when pin 231 is engaged with notched end 241 of link 242, the key is moved rearwardly or forwardly to operate link 242 and thereby rock strap 66 (Figs. 2A and 9) and thereby mesh minus gears 63 or pins gears 62 with numeral wheel gears 64.

With the machine conditioned as described above, the selected numeral keys 22 (Figs. 2A and 2B), and the corresponding selecting slides 51 are operated simultaneously to position gears 64 with respect to the teeth of actuating cylinders 63. In depressing the keys, the operator depresses only the deslred keys representing the value to be entered, and no other keys should be depressed until after the entry is completed. Toward the end of the stroke of the depressed keys 22, the lower ends thereof move the associated slides 2H and thereby rock bail 201 and operate link 2| I. The resulting rearward movement of link 2 (Fig. 9) operates through arm 2I2, shaft I54, and arm 2I8 (Figs. 43 and 8) to close contacts 9 (Figs. 5 and 8) and move clutch control lever 41 (Fig. 6) to clutch engaging position. The drive cannot begin however if any key 22 is only partially depressed, because any displaced key latching slide I86 (Fig. 8) will hold contacts 22I open. When all the displaced key slides I86 have entered the latch notches I89 (Fig. 2B) of the depressed keys, contacts 22! will close and the drive will begin. Toward the end or the cycle, cam 263 (Fig. 8) oscillates lever 259 to pull link 25$ rearwardly and thereby operate key releasing bail I9I, and also operate bellcrank 2' l2 (Figs. 5 and 8) to rock link lid (Figs. 5 and 6) to release clutch control lever 41 in sumcient time to disengage the clutch after one cycle of operation. While the operation of key-releasing bail I9I operates through slides I86 during the latter part of a cycle to open contacts 22!, 222 of the motor circuit, the momentum of the parts is sufficient to carry the parts to home position and complete the cycle of the claims appended hereto.

We, therefore, claim as our invention:

1. In an optional key-set and key-responsive calculating machine, a register, actuating means for said register, drive means for said actuating means, settable means for determining positive and negative registration on said register, selecting mechanism for controlling the entry of values in said register, ordinal keys for controlling said selecting mechanism, a key-responsive operation control key, a controlling connection from said control key to said settable means and a controlling connection between said ordinal keys and said drive means for conditioning the machine for key-responsive operation, said control key being movable in one direction to condition the connection between the ordinal keys and the drive means for key responsive operation and being selectively movable in either of two other directions to operate the connection between said control key and said settable means to condition said settable means for positive or negative registration on said register respectively.

2. In an optional key-set and key-responsive I calculating machine having a register, actuating means for said register, driving means for said actuating means, and keyboard mechanism for selecting the values for registration on said register; settable control means for controlling the "sponsive 'lated to said driving means to initiate operation state of said machine for key-set and key-reoperation, a control key operatively rethereof, and means controlled by said control key upon depression thereof for moving said settable control means to key-set position if dis-' placed therefrom.

3. In an optional key-set and key-responsive calculating machine having a register, actuating means for said register,.and keyboard mechanism for selecting the values for registration on said register; settable control means for controlling the state of said machine for key-set and key-responsive operation, a control key for initiating a clearing operation of said machine, and means controlled by said control key upon depression thereof for moving said settable control means to key-set position if displaced therefrom.

4. In an optional key-set and key-responsive calculating machine having a register, actuating means for said register, means for shifting said register relative to said actuating means, settable means for establishing a drive connection from said actuating means to said register, a keyboard mechanism for selecting thevalues for registration on said register; settable control means for controlling the state of said machine for key-set and key-responsive operation including means for setting tion establishing means, a control key associated with said shifting means for initiating a machine operation involving shifting of saidregister, and means controlled by said control key upon depressionthereoi for moving said settable control means to key-set position if displaced therefrom.

5 In an optional key-set and key-responsive calculating machine, a series of numeral wheels having gears thereon, actuating means for said numeral wheels, plus-minus gears movable from a central inactive position in either direction to mesh with said nuineral wheel gears to control additive and subtractive registration in accordance with the direction of movement from said central position, means including a key movable from an inactive position to either of two active positions to set the machine for key-responsive operation, and means controlled by said key upon movement to one of said active positions to effect meshing of said plus-minus gears with said numeral wheel gears for additive registration,

and upon movement of said key to the other active position thereof to .efiect meshing of said gears for negative registration.

CARL FRIDEN. FREDERICK C. CARROLL, JR.

said drive-connec- 

